Preparation And Characterization Of Alginate/Lanthanide Multifunctional Materials

During the last two decades,lanthanide photoluminescent hybrid materials have arracted intensive attention due to their intriguing optical properties?such as narrow emission bands,large Stoke shifts,and long luminescence lifetimes?.So far most of the studies of lanthanide hybrid materials were concentrated on silica-based system.However,silica-based hybrid materials usually show poor biocompatibility,which greatly limited their applications in biomedical field.In this thesis,we proposed a facile method to prepare luminescent hybrid materials containing alginate and lanthanide.Lanthanide luminescent centers were convalently bonded to the framework of alginate.FTIR,Photoluminescence spectra,UV,SEM,Nitrogen adsorption/desorption isotherms,TGA,MTT are characterized.This thesis has the following three parts:?1?These new hybrid materials with benzoic acid are porous and show good“antenna effect”.?2?We found that the high-luminescent hydrogels prepared by covalent bonding of tetrakis?4-carboxyphenyl?porphyrin?TCPP?with rare earth terbium and alginate,which can avoid the quenching effect of the aqueous solvents well.These new luminescent hydrogels show good biocompatibility and can act as luminescent sensors with relatively high selectivity and sensitivity for detecting Fe³⁺.They are also sensitive to pH with wide pH sensing range and high sensitivity.?3?Our newly made sodium orthovanadate,lanthanide and alginates hybrid hydrogels materials can not only overcome many disadvantages of current luminescent doped materials,but also can be used as an acetone sensor.The photoluminescent hydrogles have outstanding acetone sensing properties with quick response,high sensitivity,short recovery time and good reversibility.It is rare for hydrogels as an easily obtained acetone sensing with low cost.